真武油田垛一段典型储层构型分析

Analysis of Typical Reservoir Architecture inE2S1 of Zhenwu Oilfield

真武油田主力含油层系为三垛组一段4-7砂组(E_(2)S_(1)^(4)-E_(2)S_(1)^(7)),主要发育曲流河沉积-辫状河三角洲平原-辫状河三角洲前缘,沉积类型复杂,微相种类繁多。在沉积相研究基础上,对3种沉积类型的储层构型进行研究。发现曲流河以河道与点坝为主体构型,砂体的平面特征为单一条带状,辫状河三角洲平原整区心滩多表现为复合砂坝叠置生长,辫状河道内可见局部废弃河道发育,边部为溢岸沉积。辫状河三角洲前缘整区中上部多为河口坝砂体多期叠置,中部多发育单期远砂坝,底部为前三角洲泥。

The main oil-bearing layer in Zhenwu Oilfield is Sando Formation 4-7 Sand Formation(E_(2)S_(1)^(4)-E_(2)S_(1)^(7)),which mainly develop meandering river sediments,braided river delta plains and braided river delta fronts,with complex sedimentary types and microfacies.various kinds.Based on the study of sedimentary facies,the reservoir architecture of three sedimentary types is studied.It is found that the main structure of meandering river is channel and point bar,the sand body is characterized by a single band,and the center beach of braided river delta plain is mostly superimposed growth of composite sand bars,and some parts can be seen in braided channel Abandoned river channels are developed,and the edges are over?owing deposits.In the middle and upper part of the braided river delta front,the mouth bar sand bodies are mostly superimposed in multiple stages,the single-stage far sand bars are mostly developed in the middle,and the bottom is foredelta mud.